Some people use this rhyme as a tongue twister…

Notes

Posies can mean a bunch of flowers or a single flower.

The version from 1896 is:

If Moses supposes his toeses are roses,
Then Moses supposes erroneously;
For nobody's toeses are posies or roses,
As Moses supposes his toeses to be.

Thanks and Acknowledgements

This rhyme goes back to at least 1896, where it can be found in, "The Bachelor of arts: a monthly magazine devoted to university, Vol. 3", edited by John Seymour Wood.